Power-press.



A8 .436. PATENTED JUNE 23 1908'. 91 v. K. v. PALMER. v

POWER PRESS.

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. PATENTED JUNE 23 1908. v. K. V. PALMER.

POWBRPRBSS. APP'LIOATVION FILED nov.'27, 1907.

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' VICTOR K. V. PALMER, OF BROOKLYN, NEWYORK.

POWER-PRESS.

Specification of Letters Patent.

' Patented June 23, 1908.

Application filed November 27, 1907'. Serial No. 404,103.

To all whom it may concern:

Be it known that I, VIcToR K. V. PALMER,

a citizen of the United States, and residing at Brooklyn, in the countyof Kingsand State of New York, have invented certain new and usefulImprovements in Power Presses, of which the following is aspecification, such as will enable those skilled in the art to which itappertains to make and use the same.

This invention relates to power presses of the class used for cutting,stamping or drawing sheet metal; and the object thereof is to provideclutch devices for locking the crank shaft, while the machine is in oeration, against rotation independent of t e drive wheel in bothdirections; a further object being to provide a press of the classspecified with a double acting clutch mechanism for preventing theindependent rotation of the power wheel on the crank shaft in bothdirections while the press is in o eration, and in this manner alsoprevent the jolt, jar and noise occasioned by the operation of pressesof this class and prevent the racing of the crank shaft and accidentalinjury to operators; and with these and other objects in view theinvention consists in the construction, combination and arrangement ofparts, in connection with a power press hereinafter described andclaimed.

The invention is fully disclosed in the following specification, ofwhich the accompanying drawings form a part, in which the separate partsof my improvement are designated by suitable reference characters ineach of the views, and in which v Figure 1 is a front view of a powerpress of well known construction provlded with my improvement, part ofthe construction being in section, Fig. 2 a section on the line 2, 2 ofFig. 3, Fig. 2 a view similar to Fig. 2 but showing the parts thereof ina different position, Fig. 3 a section on the line 3, 3 of Flg. 4, Fig.4 a section on the line 4, 4 of Fi 1.

In the drawing forming part of tiis specification reference being madeto Fig. 1, I have shown a well known form of power press involving abase table a supported by legs a and on which is secured the bolster I)through which passes the spring buffer stud d which carries the springbuffer (1 which in this case consists of a rubber barrel or drumshapeddevice. Above the spring buffer d? and resting thereon is the metalwasher d with which is connected the blank holding.

ring 62 this connection being made by means of pins (1.

The spring bufier stud is provided at its upper end with the usual drawdie or punch a, and the bolster b is provided with a screw threadedcollar in which the blank holding ring d is movable and to which issecured the collar 6 which limits the upward movement of the blankholding ring (i all these parts being of the usual construction. Thepress is also provided with the usual crank shaft f having the crankwith which is connected the vertical movable lunger f which carries thepunch f and sai crank shaft is provided with the usual drive wheel f allthese parts being of the usual, construction.

It is customary, or has'been heretofore, to provide the crank shaftwhere it passes through the hub of the drive wheel with a groove g asshown in Fig. 2, and the hub of the drive wheel with a correspondinggroove g and place therein a key clutch g whichis seglmental in crosssection and provided with cy 'ndrical heads, and this clutch key isprovided at it inner end with a segmental arm 9 between which and theshaft is placed an eX- pansion spiral spring g one end of which enters asocket formed in said shaft.

Secured to the side of the frame of the press adjacent to the powerwheel is a bracket h to which is pivoted a bell crank k with which,is

connected a rod 70 which passes downwardly through a keeper h, and aspring h mounted on said rod over said keeper and serves to force the.said rod upwardly. The rod h is carried downwardly to the bottom of theframe of the press and connected with a treadle h, all of these partsbeing also of the usual construction and operation, and in the operationof this press the arm 9 of the clutch key 9 operates 1n connection-withthe bell crank 7L2 to release the clutch and permit the drive wheel torotate independent of the crank shaft, or to permit the crank shaft toturn independent of the drive wheel.

In the practice of my invention I employ another clutch key i the samein all respects as the clutch key 9 and provided with cylindrical endportions, and mounted in corresponding recesses in the crank shaft andin the hub of the drive wheel, and this clutch key t is provided at itsinner end with a segmental arm t which projects in the same direction asthe arm 9 of the clutch key g and connected with the arm a? and thecrank shaft is a pull spring 01 and the arm '5 is provided with a camface i which operates in connection with a tripper j secured to theframe work of the press and provided with a nose at 7' which engages thecam surface 1' on the arm 71 and pulls said arm out into the dottedposition shown in Fig. 4, and rocks the clutch i in a direction oppositeto that in which the .clutch g is rocked when said clutches are designedto disengage the hub of the drive wheel.

It will be observed that in Fig. 2 both the clutches or clutch keys areshown in operative position, in which the drive wheel is locked to thecrank shaft, but in Fig. 3 they are both shown in inoperative position,in which the drive wheel is independent of the crank shaft. The hub ofthe drive wheelis also provided, as shown in Figs. 2 and 2 with asupplemental recess 0, or in other words said hub is provided with threesimilar recesses, and the keys 9 and t may operate in either of saidrecesses.

In the operation of this apparatus, the clutch keys '6 and g are bothheld in operative position as shown in Fig. 2 by the springs 9 and iWhen the machine is in operation the operators foot is bearing on thetreadle 7t and the crank lever h is thrown inwardly so that the arm 9 ofthe clutch key 9 will not strike it. When the operator desires to stopthe press he moves his foot from the treadle h and the crank If isthrown back into the position shown in Fig. 1, and the arm g of theclutch key g will strike said bell crank and throw the clutch key 9 intothe inoperative position as shown in Fig. 2 and at the same time the arm77 of the clutch key 'i is engaged by the tripper j and the clutch key71 is turned in a direction opposite that of the clutch key g and thedrive wheel is unlocked from the crank shaft as shown in Fig. 2 In thisconstruction I also provide the crank shaft f, inside of the drive wheelf, with a collar is and outside of said wheel with a cap said partsbeing designed to hold the drive wheel in proper position, and the cap kalso serving to conceal the end of said shaft and the ends of the clutchkeys and to hold said clutch keys in proper position longitudinally ofthe shaft.

While operating a combination die which will draw a shell ofconsiderable depth, as for instance, three-quarters of an inch or more,a powerful rubber buffer similar to that shown at d or a powerful springbuffer, forces the washer a5 upwardly with great force and this washerstrikes the bolster b with corresponding force at the upward motion ofthe crank, and this force is also imparted to the ring (1 by the rod dwhich is forced upwardly in a similar manner, and this movement of saidparts forces the plunger f upwardly and imparts a quick movement to thecrank shaft f and causes said shaft to race in the drive wheel f. Theconstant repetition of this operation by reason of the washer d strikingthe bottom of the bolster 12 produces a violent and oftrepeatedhammering similar to that given by the use of a sledge or other heavyhammer, and when a number of these presses are employed the result isvery annoying and obj ectionable. This continuous pounding also resultsin throwing the die out of its true adjustment and the punch will beginto shear or shave off on one side and will rapidly become impaired; butby means of my improvement which consists in providing the supplementalclutch key, I prevent the racing of the crank shaft in the drive wheeland prevent the washer d from striking the bottom of the bolster aviolent blow and thus avoid the hammering result referred to and alsoavoid the throwing out of operative position of the separate parts ofthe apparatus including the die and plunger and secure a uniformrotation of the crank shaft and a constant and steady operation of thepress without danger of injury thereto and also without danger of injuryto the operator.

It will be seen that both of the keys extend through the entire lengthof the hub, and both of said keys may be conveniently reached andmanipulated, and this is one of the important, features of myconstruction.

Having fully described my invention, what I claim as new and desire tosecure by Letters Patent, is

1. A power press of the class described, provided with a crank shaft anda drive wheel mounted thereon, the hub of the drive wheel being providedin its inner face with a plurality of longitudinal recesses which aresegmental in cross section, the crank shaft being also provided where itpasses through the hub of the drive wheel with two similar recesseswhich are longer than the hub of the drive wheel, and two clutch keysmounted in said recesses, and longer than the hub of the drive wheel,the end portions of said clutch keys being cylindrical in cross section,and that part thereof within the hub of the drive wheel being segmentalin cross section, one of said keys being operated in the usual manner tosecure said wheel to the shaft in the operation of the machine when theshaft is turned in one direction, and the other key being automaticallyoperated for locking said wheel to said shaft and )revent the rotationof the shaft in said whedl in the opposite direction.

2. A power press of the class described, provided with a crank shaft anda drive wheel mounted thereon, the hub of the drive wheel being providedin its inner face with a plurality of longitudinal recesses which aresegmental in cross section, the crank shaft being also provided where itpasses through the hub of the drive wheel with two similar which extendin the same recesses which are longer than the hub turning in onedirection, and automatically of the drive wheel, two clutch keys mountedI operatlng devices for securin said wheel to in said recesses andlonger than the hub of said shaft when the said sha't is turning in 15the drive wheel, the inner ends of said clutch the opposite direction.keys being provided with se mental arms In testimony that I claim theforegoing as irection, the my invention I have signed my name in arm ofone of said keys being connected with presence of the subscribingwitnesses this the shaft by an expansion spring, and the I 23rd day'ofNovember, 1907.

arm of the other by a pull spring, and pedal VICTOR K. V. PALMER.

operated devices for operating one of said Witnesses: keys to securesaid wheel to the shaft in the C. E. MULREANY, operation of the machinewhen the shaft is M. E. DooDY.

